• 1973-1979
  Secondary education, Christelijk Gymnasium Sorghvliet, The Hague
• 1979-1986
  Degrees in Dutch law (1983) and tax law (1986), Leiden University

• 1983-1986
  Assistant tax adviser, Moret Gudde Brinkman Belastingadviseurs, The Hague
• 1986-1990
  Working at ABN, Amsterdam
• 1990-1991
  Tax adviser, Loyens & Volkmaars, Amstelveen
• 1991-1994
  Self-employed tax and financial adviser, The Hague
• 1994-1998
  Senior tax adviser, Ernst & Young Belastingadviseurs
• 1998-2019
  Senior partner, Ernst & Young Belastingadviseurs, The Hague
• 2015-2019
  Member of the Senate for the CDA (tax legislation/tax affairs)
• 2019-2020
  Strategic adviser, Ministry of the Interior and Kingdom Relations, based in Bonaire
• 2020-2021
  Government commissioner in St Eustatius
• 10 January 2022
  Appointed State secretary for Tax Affairs and the Tax Administration in the fourth Rutte government

• 1986-1990
  Member of Wassenaar municipal council for the CDA
• 1990-1994
  Member of Wassenaar municipal executive
• 1994-1999
  Leader of the CDA group on Wassenaar municipal council
• 1999-2001
  CDA party leader
• 2012
  Member of the CDA programme committee for the general election
• 2013
  Chair of the CDA selection committee for the European Parliament elections
• 2009-2015
  Chair of the Eduardo Frei Foundation, a foundation for international solidarity founded by the CDA
• April 2021 – December 2021
  Interim CDA party leader

Marnix van Rij has held positions on the boards of many organisations, including:

• Member of the board of Stichting Ondersteuning N.H. Dorpskerk Wassenaar, a charity for the support of Wassenaar village church
• Deputy chair of the Wassenaarsche Bouwstichting housing association
• Chair of the Association for Personnel Services Overseas (Vereniging PSO)
• Treasurer of Stichting Vrienden van het Haags toneel, a local performing arts fund
• Member of the board of Stichting Jan Cornelia, a philanthropic fund